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Help Needed to Insert Dynamic Text into Downloadable Picture

Hi everyone, this is my first post after being recommended to these forums by a friend of mine, so I hope to be on here more often, helping where I can.

I would really appreicate some help with something I actually have no idea how to start. I want users of my forum to be able to create signature images which are consistent. E.g. I want the same stock image with the text changing.

I would like to have an html form which is filled in, which when is sent loads an image with the text they have entered.

I have seen this done elsewhere on the web with "newspaper headline generators"

Does anyone know of any tutorials or scripts out there which would help me.

Comment out the Content-type header and you will see that PHP throws some errors hence your browser complains that the image is corrupted (because it's actually sent some error message rather than an image).